Why does built-in set not take keyword arguments?

[Steven Watanabe]

I'm trying to do something like this in Python 2.4.3:

class NamedSet(set):
def __init__(self, items=(), name=''):
set.__init__(self, items)
self.name = name

class NamedList(list):
def __init__(self, items=(), name=''):
list.__init__(self, items)
self.name = name

I can do:

but I can't do:
TypeError: set() does not take keyword arguments

How come? How would I achieve what I'm trying to do?
Thanks.